JPH11308897A - Power supply of outboard engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable holding of a voltage higher than the constant level and prevent engine stall when a voltage drops, by providing a capacitor for compensating operation of an electronic control unit when a voltage of the second power supply line is lowered. SOLUTION: This power supply is provided with a rectifier 18a for rectifying an output voltage of a self-power generator 15 which is driven by an outboard engine for power generation, and a regulator 18b for momentarily terminating the supply voltage to a first power supply line 30 to once reduce the voltage when an output power voltage is higher than the predetermined voltage and then recovering the operation for re-charging. The regulator 18b is controlled to be terminated to perform re-charging in the moment that an output waveform has reached the voltage to be regulated but when a battery 20 is disconnected, termination of several ms is generated when the voltage reaches the regulated voltage, thereby no longer maintaining the power supply relay 35 to be used in the electronic control unit 27 or the like and therefore loading a capacitor 34 on the power supply circuit. As a result, voltage higher than a constant voltage can be maintained during the termination and generation of engine stall can also be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power supply device for an outboard motor engine.

[0002]

2. Description of the Related Art Today, an outboard motor engine has an electronically controlled fuel injection device (EFI) that injects fuel from an injector into an intake passage in accordance with a control command of a central processing unit in response to a request for improving exhaust gas and fuel efficiency. Adoption is possible.

[0003] Normally, a starter motor is provided as standard equipment in a medium or larger outboard engine, and a battery is installed in the ship accordingly. In addition, batteries in ships are used not only for outboard motors but also as power sources for navigation lights, fish finder, and the like. Here, the battery is constantly charged during operation of the outboard motor by using power generation by a coil provided in a flywheel magneto of the outboard motor. EF
In an outboard motor equipped with a system that uses a battery such as I, a power supply coil is provided in the magneto exclusively for the self-consumable parts (injector, fuel pump, etc.), assuming that the battery voltage is low. I was equipped.

[0004]

However, in the conventional outboard motor engine, the exclusive power supply is provided in the magneto as described above by using the EFI so that the engine does not stop even if the battery is disconnected, and the injector is used. Had power. However, adoption of such a dedicated power supply has a disadvantage that the configuration of the charging coil in the magneto is complicated. Also, for its power supply, voltage control components,
Wiring is required, and the difficulty in making the coil causes a significant increase in cost.

[0005] Further, if the power supply of the injector or the like is supplied by the magnet as described above, if there is an abnormality in the battery charging system, no abnormality can be seen in the engine.
If the vehicle is operated as it is, it is consumed by auxiliary equipment such as navigation lights without being able to charge the battery, the battery voltage may be reduced without your knowledge, and restarting may be difficult due to running out of the battery. Further, in the case of a battery-ignited engine, if the contact failure or the disconnection of the battery occurs, the engine stops, so that control that does not cause such a stop state is required. Furthermore, by the voltage short-circuit control of the regulator,
Noise may get on the power supply circuit and affect the operation of the engine.

Japanese Patent Laid-Open Publication No. Hei 10-37780 has been proposed as a countermeasure when a problem occurs in a battery. However, in this technique, a spare battery or a coil dedicated to the fuel injection system is provided in the magnet, and the problem of increased cost remains. In Japanese Patent Application Laid-Open No. Hei 9-130990, when the battery is greatly consumed, the load on the generator is limited to the fuel injection system and the fuel pump. However, in this technique, even when the engine is running at a low speed, the operation continues, and when the engine stalls, the battery is completely discharged, and there is a possibility that the engine cannot be restarted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An outboard motor engine capable of maintaining a voltage equal to or higher than a certain level even when the voltage drops due to a regulator and preventing engine stall due to disconnection of a battery. It is an object of the present invention to provide a power supply device.

[0008]

The present invention has the following configuration to achieve the above object. The invention of claim 1 is
In an outboard motor engine provided with an electronic control fuel injection device, a self-powered device that generates power by being rotated by a crankshaft of the outboard engine, and a first power source when the output voltage of the self-powered device is equal to or higher than a predetermined voltage A regulator for temporarily lowering and then returning the supply voltage to the path, a first power supply path for conducting the output voltage of the regulator to the battery, and a second power supply path for conducting the voltage from the first power supply path to the electronic control unit. An outboard motor engine power supply device comprising: a power supply path; and a capacitor for compensating operation of an electronic control unit when a voltage drop in a second power supply path. According to a second aspect of the present invention, in the second power supply path, a power supply voltage is supplied to the electronic control unit via a power supply relay, and the capacitor is connected to the primary side of the power supply relay operating coil in the second power supply path. An outboard motor engine power supply device having a capacity for compensating the ON operation of a power supply relay when the voltage of the first power supply path drops. According to a third aspect of the present invention, the condenser has a capacity that is equal to or less than an operation compensation voltage of the electronic control unit when the outboard motor engine is lower than a predetermined rotation speed. This is the power supply for the engine. The invention according to claim 4 is the power supply device for an outboard motor engine according to claim 3, wherein the capacity of the capacitor is 470 (μF) or more.

According to the first aspect of the present invention, in an outboard motor engine provided with an electronically controlled fuel injection device, the supply voltage to the first power supply path is reduced when the output voltage of the self-generator is equal to or higher than a predetermined voltage. Since the regulator has a regulator for temporarily lowering and then returning, the voltage drops momentarily by the regulator when the battery is disconnected (momentary or long-term), and the power supply relay used in the electronic control unit or the like ( Claim 2) cannot be maintained. For this reason, the operation of the electronic control unit is compensated as a capacity capable of smoothing the output of the self-generator even when a momentary voltage drop occurs due to the regulator when the second power supply path is disconnected from the battery due to the capacitor. The power supply of the unit is ensured, and no accidental engine stall is caused by disconnection of the battery.

According to the third aspect, the capacitor is:
When the outboard motor engine is lower than the predetermined rotation speed, the capacity is lower than the operation compensation voltage of the electronic control unit.Therefore, when the battery is disconnected, the engine stops at a certain rotation speed or less, and the battery goes down due to another load. Can be prevented. In addition, the stop can inform the occupant of an abnormality such as the battery being disconnected. For example, if the capacity of the capacitor is set to 470 (μF) or more, the power supply relay is not held at the time of low rotation of 2000 (rpm) or less and the engine is reliably stalled as shown in FIG. Therefore, the battery does not run out.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are explanatory diagrams of an outboard motor 2 equipped with an electronically controlled fuel injection engine (internal combustion engine) 1 according to the embodiment, FIG. 3 is an explanatory diagram of a power supply device of the engine 1, and FIGS. 8 is an explanatory diagram of each example of a power supply voltage related to a battery connection state, and FIG. 8 is an explanatory diagram of a relationship between a capacitor capacity of the power supply device and an engine speed.

As shown in FIG. 1, the outboard motor 2 is mounted on a transom (stern beam) 4 of a hull 3 via a bracket 5. The outboard motor 2 has a drive shaft housing 6 which is a hollow body extending vertically in the rear portion of the bracket 5 and has a substantially spindle-shaped horizontal cross section. , An engine holder 7 is formed, and the engine 1 is installed above the holder 7. A gear case 8 is connected to a lower portion of the drive shaft housing 6, and a propeller shaft having a propeller 9 directed horizontally rearward is rotatably supported on the gear case 8.

As shown in FIG. 2, the engine 1 is a two-cycle four-cylinder engine (4 cylinders) having a cylinder head 10, a cylinder block 11, and a crankcase 12.
The crankshaft 13 may be rotatably supported in the clan case 12 substantially vertically along the vertical direction. The outer surface of the engine 1 is covered with an engine cover 14 (see FIG. 1).

A power supply for the engine 1 of the outboard motor 2 will be described. In the power supply device according to the embodiment, as shown in FIG. 2, each device is disposed in each part of the engine. The outboard motor 2 is provided with a self-power generation device (flywheel magneto 15) at one end of the crankshaft 13. That is, the generally bowl-shaped rotor 17 of the flywheel magneto 15 is fastened to the upper end of the crankshaft 14 and rotates in accordance with the rotation of the engine 1. The stator coil 16 of the flywheel magneto 15 is fixed to the crankcase 12 in the inner space covered by the rotor 17. In accordance with the rotation of the crankshaft 13 of the engine 1, power is generated from the stator coil 16 by the magnet 17 a attached to the inner periphery of the rotor 17.

Since the flywheel magneto 15 outputs AC power, a rectifier 18a is usually provided separately to convert the output AC to DC. Further, a regulator 18b is provided to prevent overcharging. The above-mentioned rectifiers and regulators also have an integrated type in addition to a separate type,
For outboard motors of medium size or larger, one-piece products are used as standard. The output of the flywheel magneto 15 has a charging voltage controlled by the rectifier 18a and the regulator 18b, and charges the battery (20) via the battery cable 19.

Normally, in the engine 1 having a large rotation fluctuation, a short-circuit type is used as the regulator 18b, and the output not used for charging and consumption is converted to heat and consumed. In the above case, the output waveform of the regulator 18b is short-circuited at the moment when the voltage to be adjusted is reached, and is controlled so as to perform charging again.

In the engine 1, a plug cap 22 of an ignition plug is connected by a cable from an ignition coil 21 adjacent to the cylinder head cover 10.
An exhaust manifold 23 is disposed in the vicinity of the exhaust manifold 23 in parallel with the crankcase. Further, a water return hose 24 is provided in parallel with the exhaust manifold 23. Further, a fuse 25 and an electrical component holder 26 are disposed behind the flywheel magneto 15,
Below this, an electronic control unit (ECU) 27 is provided. Power and signals are transmitted to each cable by the wire harness 28.

The power supply device of the embodiment can be shown by the circuit diagram of FIG. As shown in the circuit of FIG. 3, the power supply device includes a rectifier 18a that rectifies an output voltage of a flywheel magnet (self-powered generator) 15 that is driven by the outboard motor engine 1 to generate power, and that the output voltage is a predetermined voltage ( For example, 1
4.5 V) or more, a regulator 18b that momentarily short-circuits the supply voltage to the first power supply path 30 to temporarily lower the supply voltage to the first power supply path 30 and then returns to perform charging again. First power path 30 conducting to 20
A second power supply path 32 for conducting a voltage from the first power supply path 30 to the electronic control unit 27, and a second power supply path 3
And a capacitor 34 for compensating the operation of the electronic control unit 27 and other loads in the event of a voltage drop of 2.

In the second power supply path 32, a power supply voltage is supplied to the electronic control unit 27 via a power supply relay 36, and the capacitor 34 is connected to the second power supply path 32.
Is connected to the primary side of the operating coil 36a of the power supply relay 36 and compensates for the ON operation of the power supply relay 36 when the voltage of the first power supply path 30 drops. An ignition switch 35 is interposed on the temporary side of the power supply relay 36 and on the downstream side of the condenser 34 so as to switch the stop operation of the engine 1.

In the case of the above-mentioned regulator 18b, the output waveform is short-circuited at the moment when the voltage to be regulated is reached, and is controlled to perform charging again. Here, when the battery 20 comes off, when the voltage reaches the adjustment voltage, a short circuit of several milliseconds occurs, and the power supply relay 36 used in the electronic control unit 27 or the like cannot be held, and the system goes down. . In order to solve such a problem of system down, a capacitor 34 is mounted on the power supply circuit. By installing the capacitor 34, the adjuster 1
8B, it is possible to hold a voltage equal to or higher than a certain level, and the power supply relay 36 can be held. Therefore, the battery 20 during the operation of the engine
It is possible to prevent a sudden stall from occurring at the time of detachment.
The capacitor 34 has an appropriate capacity so that when the battery 20 comes off, the battery
In order to prevent the outboard motor 1 from rising, it is possible to notify the abnormality by stopping the engine at a certain rotation speed or less as a capacity that becomes equal to or less than the operation compensation voltage of the electronic control unit 27 when the outboard motor engine 1 is lower than the predetermined rotation speed. Becomes

The capacitor 34 itself is used for ignition, injection,
It can absorb high current control noise (various surge noises) and also plays a role in protecting engine control.
When the terminal of the battery 20 is coming off, the terminal ON,
OFF (contact, detachment) becomes noise and enters the electronic control unit 27, but this can also be reduced by the capacitor 34.

The capacitor 34 used for the above purpose
Is mounted on the harness 28 of the power supply circuit in the embodiment, but may be mounted at any position on the power supply circuit. For example, it may be on the power input board 27a of the electronic control unit 27 in FIG. As described above, the voltage regulator 18a used in the outboard motor or the like is usually of the SCR (thyristor) type, and is configured to short-circuit the circuit when the generated voltage reaches the regulated voltage.

When the outboard motor engine 1 is at a very low speed,
As shown in FIG. 4, the power generation is not sufficient, the voltage does not reach the regulated voltage, the voltage is not short-circuited, and the power supply relay 36
Is held. However, the rotation speed is not in a practical range such as 300 rpm.

When the battery 20 is present, a portion that is higher than the voltage of the battery 20 is used for charging, and this also reaches the regulated voltage and is short-circuited. However, as shown in FIG. It does not become 0V.

On the other hand, when there is no battery 20, since the above-mentioned battery 13.5V does not exist, as shown in FIG. 6, the voltage becomes close to 0V, the power supply relay 36 cannot be held, and engine stall occurs. Let it.

When the capacitor 34 is provided as described above, as shown in FIG. 7, the valley of each generated voltage can be blunted by the discharge of the capacitor by the electric charge stored in the capacitor 34, and the voltage can be prevented from lowering. It is. However, this is the battery 2 in this system which depends on the generated voltage.
In order to prevent zero rise, a capacitor for lowering the overall level at low rotation is selected. In an example of the outboard motor 2,
Assuming a relationship between the capacitor capacity and the engine stall speed as shown in FIG. 8, the capacity of the capacitor is 470 (μF).
If it is less than 2000 rpm, the engine can be stalled at 2000 rpm or more.

In the above-described embodiment, it is possible to maintain a voltage equal to or higher than a certain level even when the regulator 18b is short-circuited. Further, it is possible to prevent a sudden stall from occurring when the battery 20 comes off during the operation of the engine 1. In addition, by setting the capacity of the capacitor 34 to an appropriate size, it is possible to stop the engine at a certain rotation speed or less and notify the abnormality to prevent the battery 20 from rising due to another load when the battery 20 comes off. Further, the capacitor 34 itself can absorb noises of ignition, injection, and large current control, and can exert a role of protection of the engine 1 control.

Although the preferred embodiment of the present invention has been described in the above embodiment, it goes without saying that the present invention is not limited to this.

[0029]

As described above, according to the present invention, a voltage equal to or higher than a certain level can be maintained even when a short circuit is caused by the regulator. Further, it is possible to prevent a sudden stall from occurring when the battery is disconnected during operation of the engine. In addition, by setting the capacity of the capacitor to an appropriate value, it is possible to stop the engine at a certain rotational speed or less and notify the abnormality to prevent the battery from being discharged by another load when the battery is disconnected. In addition, the capacitor itself can absorb noise of ignition, injection, and large current control, and can exert a role of protection of engine control.

[Brief description of the drawings]

FIG. 1 is an external explanatory view of an outboard motor engine according to an embodiment of the present invention.

FIG. 2 is a side view of an engine of the outboard motor.

FIG. 3 is a circuit diagram of a power supply device.

FIG. 4 is an explanatory diagram of an example of a charging voltage waveform at the time of low rotation of the power supply device.

FIG. 5 is an explanatory diagram of a charging voltage waveform example of the power supply device.

FIG. 6 is an explanatory diagram of a voltage waveform when the battery is disconnected when there is no capacitor.

FIG. 7 is an explanatory diagram of a voltage waveform when a battery is disconnected when there is a capacitor.

FIG. 8 is an explanatory diagram of an example of the relationship between the capacity of a capacitor and the engine stall speed;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 engine 2 outboard motor 15 self-generator (flywheel magneto) 16 stator coil 17 rotor 18a rectifier 18b regulator 20 battery 27 electronic control unit 30 first power circuit 32 second power circuit 34 capacitor 36 power relay

Claims (4)

[Claims] 1. An outboard motor engine provided with an electronically controlled fuel injection device, comprising: a self-generator that generates power by being rotated by a crankshaft of the outboard engine; and an output voltage of the self-generator being equal to or higher than a predetermined voltage. A regulator for temporarily lowering the supply voltage to the first power supply path and then restoring it; a first power supply path for transmitting the output voltage of the regulator to the battery; and a voltage from the first power supply path to the electronic control unit. An outboard engine power supply, comprising: a second power path for conduction; and a capacitor for compensating operation of the electronic control unit when the voltage of the second power path drops. 2. A power supply voltage is supplied to the electronic control unit via the power supply relay in the second power supply path, and the capacitor is connected to the primary side of the power supply relay operating coil of the second power supply path. A power supply device for an outboard engine, wherein the power supply device has a capacity for compensating an ON operation of a power supply relay when a voltage of a first power supply path drops. 3. The capacitor according to claim 1, wherein the condenser has a capacity that is equal to or lower than an operation compensation voltage of the electronic control unit when the outboard motor engine is lower than a predetermined rotation speed.
A power supply device for an outboard motor engine according to Claim 1. 4. The outboard motor engine power supply according to claim 3, wherein the capacity of the capacitor is 470 (μF) or more.